Pengawasan Majelis Pengawas Notaris terhadap Notaris yang tidak Diketahui Keberadaannya (Studi Simulasi terhadap Pelanggaran Jabatan Notaris di Wilayah Jakarta Utara) = Supervision of the Notary Supervisory Assembly on Notaries whose Existence is not Known (Simulation Study of Violations of the Office of a Notary in the North Jakarta Region)